Injection pulse width control method for natural gas and gasoline dual-fuel engine
A technology of injection pulse width and control method, which is applied in the direction of engine control, combustion engine, internal combustion piston engine, etc., can solve the problems of complex ECU hardware circuit structure, multiplication of stored codes, and large hardware circuit changes, so as to save hardware development costs , fewer modifications, and lower cost
Active Publication Date: 2013-01-23
CHONGQING CHANGAN AUTOMOBILE CO LTD
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Problems solved by technology
The increased high-power driving circuit and power driver for driving the air nozzle will greatly change the original gasoline engine ECU hardware circuit, and the ECU hardware circuit structure is complicated and the cost is high
However, the amount of stored codes in a single ECU of a dual-fuel engine doubles, resulting in large memory consumption and reduced operating efficiency
Method used
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[0021] The present invention will be further described below in conjunction with the accompanying drawings.
[0022] The inventive method is realized based on the dual-fuel engine control system, figure 2 It is a block diagram of a dual-fuel engine control system according to an embodiment of the present invention. The control system is to refit the gasoline engine control system. On the basis of the gasoline engine control system, a natural gas supply system, a sensor, and a natural gas / gasoline selection device (such as image 3 As shown), natural gas injection pulse width correction module and ignition timing correction module, etc. The natural gas supply system adopts the existing mature technology, and the newly added sensors include gas pressure sensor, gas temperature sensor, pressure reducer temperature sensor, etc., in the ECU Injection pulse width correction module 1, ignition timing correction module 2, etc. are added to the main control chip MCU. The original gas...
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The invention discloses an injection pulse width control method for a natural gas / gasoline dual-fuel engine. In the method, based on the original gasoline engine control system, injection pulse width correction logic is added on the basis of original fuel control logic, and a gasoline nozzle and a gas nozzle share a high-power drive circuit and a power driver of the original gasoline engine control system. In the gasoline mode, the injection pulse width output by an injection pulse width correction module is fuel injection pulse width; and in the gas status, fuel pulse width and fuel injection pulse width are directly corrected into gas pulse width and injection gas pulse width signals to be output to an external natural gas / gasoline selection device. In the method, fuel / gas signals are output by sharing one circuit, dual-fuel ECU (Electronic Control Unit) control logic in the prior art is optimized, the high-power drive circuit and the power drive circuit, especially aiming at gas, are reduced, the response efficiency of ECU duel-fuel control is improved, less modification is carried out on the traditional gasoline engine circuit, and the hardware development cost is saved.
Description
technical field [0001] The invention belongs to the field of engine electronic control, and relates to a dual-fuel engine control system, in particular to a fuel / gas injection pulse width control method for natural gas and gasoline dual-fuel engines. Background technique [0002] With the increasingly serious environmental and energy problems, natural gas has become one of the important fuels for engines. Retrofitting a gasoline engine into a natural gas / gasoline dual-fuel engine can make more efficient use of energy and alleviate the environmental crisis. [0003] Existing natural gas / gasoline dual-fuel engine control systems such as figure 1 As shown, in the single ECU of the dual-fuel engine control system, the control logic in gasoline mode and the control logic in natural gas mode are stored; in terms of actuator drive, the fuel injector is driven by a high-power drive circuit and a power driver. The air nozzle is driven by a high-power driving circuit and a power dri...
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IPC IPC(8): F02D19/06
CPCY02T10/36Y02T10/30
Inventor 严臣树单玉梅郑慧高锋张强
Owner CHONGQING CHANGAN AUTOMOBILE CO LTD